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547.458.61:661.185.232 N. S. Butrim, and T. L. YurkshtovichThe reaction kinetics of an aqueous suspension of potato starch, various amounts of NaOH, and cationic 3-chloro-2-hydroxypropyltrimethylammonium (chloride) were studied in detail. It was found that the compositions of the sparsely substituted cationic starch ethers and the efficiency of the reaction depended strongly on the ratio of components in the alkylating mixture. The physicochemical properties of the synthesized samples were studied using chemical analysis, scanning electron microscopy, x-ray structure analysis, and thermogravimetry. It was shown that the temperature regime of the reaction had a determining influence on the thermal stability and structural changes of the cationic starch derivative.Starch derivatives containing cationic groups are important commercial products that are widely used as effective additives in the cellulose and paper, textile, cosmetic, and other branches of industry. Cationic starches with quaternary ammonium ethers have the broadest application [1] and have been used effectively over the last decades in the production of paper and cardboard to increase the retention of fiber and filler, suppress the disintegration process, and increase the surface strength and rupture strength of paper [2]. Such cationic starches can be prepared by various methods (dry, wet, extrusion) by adding to the starch macromolecule functional groups carrying a positive charge [3][4][5][6]. Of the large number of available reagents, 3-chloro-2-hydroxypropyltrimethylammonium chloride (CHPTMAC) is used most often.Cationic ethers are obtained via reaction of native starch with CHPTMAC under various conditions according to the general Scheme 1.

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